Explain Relativity To A Six Years Old

[Orcus]

Einstein once said "if you can't explain it to a 6 year old you don't understand it yourself". 

Can you try and explain Relativity as simple as possible? 

[Vmedvil]

Substance and Energy curve  space and time, Energy makes space size decrease, time speed slow down, and substance increase, Energy and substance is due to forces, Energy is movement. Energy curve of space and time creates gravity. Energy and substance are the same thing, Einstein was really smart and found a way to make of this work in math, which is relativity. it seems space and time are part of the same thing.

Edited October 3, 2017 by Vmedvil

[DrKrettin]

4 hours ago, Orcus said:

Einstein once said "if you can't explain it to a 6 year old you don't understand it yourself". 

I find it very difficult to believe that he said that. A 6-year-old probably does not grasp physical concepts of mass, time, energy, force and 3-D space sufficiently to understand even Newton's laws. 

[DrP]

To a 6 year old:-

If one car is going north at 60 mph and another is coming in the opposite direction at 30 mph.....  Their speeds relative to each other are 90 mph....  if they crash then they have all the energy from their respective velocities. When you get very, very, very fast...  approaching the speed of light, it no longer works that way because nothing can go faster than light...  no one knows why..... but I wouldn't worry your 6 year old head about it for now.